/// <remarks/>
public void Clone(out OpcRcw.Comn.IEnumString ppenum)
{
lock (m_lock)
{
try
{
ppenum = new EnumString(m_strings);
}
catch (Exception e)
{
throw ComUtils.CreateComException(e);
}
}
}
/// <summary>
/// Creates an enumerator for the elements contained with the current branch.
/// </summary>
private EnumString GetEnumerator(bool isBranch)
{
try
{
OPCHDA_BROWSETYPE browseType = (isBranch)?OPCHDA_BROWSETYPE.OPCHDA_BRANCH:OPCHDA_BROWSETYPE.OPCHDA_LEAF;
OpcRcw.Comn.IEnumString pEnumerator = null;
m_browser.GetEnum(browseType, out pEnumerator);
return(new EnumString(pEnumerator));
}
catch (Exception e)
{
throw Technosoftware.DaAeHdaClient.Utilities.Interop.CreateException("IOPCHDA_Browser.GetEnum", e);
}
}
public void Clone(out OpcRcw.Comn.IEnumString ppenum)
{
EnumString str;
Monitor.Enter(str = this);
try
{
ppenum = new EnumString(this.m_strings);
}
catch (Exception exception)
{
throw Server.CreateException(exception);
}
finally
{
Monitor.Exit(str);
}
}
/// <summary>
/// Return an IEnumString for a list of Areas as determined by the passed parameters.
/// </summary>
/// <param name="dwBrowseFilterType">
/// OPC_AREA - returns only areas.
/// OPC_SOURCE - returns only sources.</param>
/// <param name="szFilterCriteria">A server specific filter string. A pointer to a NULL string indicates no filtering.</param>
/// <param name="ppIEnumString">Where to save the returned interface pointer. NULL if the HRESULT is other than S_OK or S_FALSE.</param>
public void BrowseOPCAreas(
OPCAEBROWSETYPE dwBrowseFilterType,
string szFilterCriteria,
out OpcRcw.Comn.IEnumString ppIEnumString)
{
ppIEnumString = null;
if (dwBrowseFilterType != OPCAEBROWSETYPE.OPC_AREA && dwBrowseFilterType != OPCAEBROWSETYPE.OPC_SOURCE)
{
throw ComUtils.CreateComException("BrowseOPCAreas", ResultIds.E_INVALIDARG);
}
try
{
lock (m_lock)
{
// find the current node.
INode parent = null;
// ensure browse stack has been initialized.
if (m_browseStack.Count == 0)
{
parent = m_session.NodeCache.Find(Objects.Server);
m_browseStack.Push(parent);
}
parent = m_browseStack.Peek();
if (parent == null)
{
throw ComUtils.CreateComException("BrowseOPCAreas", ResultIds.E_FAIL);
}
List <string> names = new List <string>();
IList <INode> children;
////// find children.
children = m_session.NodeCache.Find(parent.NodeId, ReferenceTypes.HasEventSource, false, true); // This would also include
// the HasNotifier reference which is
// a subtype of HasEventSource
foreach (INode child in children)
{
// ignore external nodes.
if (child.NodeId.IsAbsolute)
{
continue;
}
// ignore non-objects/variables.
if ((child.NodeClass & (NodeClass.Object | NodeClass.Variable)) == 0)
{
continue;
}
// ignore duplicate browse names.
if (names.Contains(child.BrowseName.ToString()))
{
continue;
}
// For a node to be an area, it has to have the 'HasNotifier' reference and must
// allow event notification (the EventNotifier attribute is set to SubscribeToEvents)
// For a node to be a source, it should be the target of the HasEventSource reference
if (IsValidNode((NodeId)child.NodeId, child.BrowseName.ToString(), dwBrowseFilterType))
{
if (String.IsNullOrEmpty(szFilterCriteria))
{
names.Add(child.BrowseName.ToString());
}
else
{
// apply filters
if (ComUtils.Match(child.BrowseName.ToString(), szFilterCriteria, true))
{
names.Add(child.BrowseName.ToString());
}
}
}
}
// create enumerator.
ppIEnumString = (OpcRcw.Comn.IEnumString) new EnumString(names);
}
}
catch (Exception e)
{
Utils.Trace(e, "Unexpected error in BrowseOPCAreas");
throw ComUtils.CreateComException(e);
}
}
